[C:1](#N)C.[F:4][C:5]1[C:6]([OH:13])=[C:7]([CH:10]=[CH:11][CH:12]=1)[CH:8]=[O:9].C(=O)([O-])[O-].[K+].[K+].CI>O>[F:4][C:5]1[C:6]([O:13][CH3:1])=[C:7]([CH:10]=[CH:11][CH:12]=1)[CH:8]=[O:9]To an acetonitrile (50 mL) solution containing 3.01 g (21.5 mmol) of commercially available 3-fluoro-2-hydroxybenzaldehyde were added 5.92 g (42.8 mmol) of potassium carbonate and 6.66 mL (107 mmol) of methyl iodide, and the mixture was stirred at 90° C. for 3 hours. After allowing to stand at room temperature overnight, the reaction mixture was poured into water, and extracted with ethyl acetate. The organic layer was successively washed with water and brine, and dried over anhydrous magnesium sulfate. The solvent was removed, and the obtained residue was purified by silica gel column chromatography (Wako gel C-100, hexane-ethyl acetate, gradient) to obtain 3.22 g of a crude product of 3-fluoro-2-methoxybenzaldehyde.
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